<html>

<head>
    <meta charset="utf-8" />
    <title>这是标题</title>
</head>



<body>
    <!-- 1.输入控件 -->

    <!-- (1)文本框 -->
    <form action="#" method="get">
        用户名:<input type="text" name="username"><br>
        <!-- (2)密码框 -->
        密&nbsp;&nbsp;&nbsp;&nbsp;码:<input type="password" name="password"><br>
        <!-- (3)文本域 -->
        自我介绍:<textarea name="textarea" rows="3" cols="30"></textarea><br>
        <input type="submit" value="提交数据">
    </form>

</body>

</html>